Bicycle



FIG. 1 is a side elevational view of a bicycle showing my new design the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an enlarged left side and rear perspecive view thereof; and,

FIG. 4 is an enlarged bottom plan view thereof. 

The ornamental design for a bicycle, as shown. 